var XHR = window.XMLHttpRequest || function() {
try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); } catch (e1) {}
try { return new ActiveXObject("Msxml2.XMLHTTP.3.0"); } catch (e2) {}
try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch (e3) {}
throw minErr('$httpBackend')('noxhr', "This browser does not support XMLHttpRequest.");
};
/**
* @ngdoc object
* @name ng.$httpBackend
* @requires $browser
* @requires $window
* @requires $document
*
* @description
* HTTP backend used by the {@link ng.$http service} that delegates to
* XMLHttpRequest object or JSONP and deals with browser incompatibilities.
*
* You should never need to use this service directly, instead use the higher-level abstractions:
* {@link ng.$http $http} or {@link ngResource.$resource $resource}.
*
* During testing this implementation is swapped with {@link ngMock.$httpBackend mock
* $httpBackend} which can be trained with responses.
*/
function $HttpBackendProvider() {
this.$get = ['$browser', '$window', '$document', function($browser, $window, $document) {
return createHttpBackend($browser, XHR, $browser.defer, $window.angular.callbacks,
$document[0], $window.location.protocol.replace(':', ''));
}];
}
function createHttpBackend($browser, XHR, $browserDefer, callbacks, rawDocument, locationProtocol) {
// TODO(vojta): fix the signature
return function(method, url, post, callback, headers, timeout, withCredentials, responseType) {
var status;
$browser.$$incOutstandingRequestCount();
url = url || $browser.url();
if (lowercase(method) == 'jsonp') {
var callbackId = '_' + (callbacks.counter++).toString(36);
callbacks[callbackId] = function(data) {
callbacks[callbackId].data = data;
};
var jsonpDone = jsonpReq(url.replace('JSON_CALLBACK', 'angular.callbacks.' + callbackId),
function() {
if (callbacks[callbackId].data) {
completeRequest(callback, 200, callbacks[callbackId].data);
} else {
completeRequest(callback, status || -2);
}
delete callbacks[callbackId];
});
} else {
var xhr = new XHR();
xhr.open(method, url, true);
forEach(headers, function(value, key) {
if (value) xhr.setRequestHeader(key, value);
});
// In IE6 and 7, this might be called synchronously when xhr.send below is called and the
// response is in the cache. the promise api will ensure that to the app code the api is
// always async
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {
var responseHeaders = xhr.getAllResponseHeaders();
// TODO(vojta): remove once Firefox 21 gets released.
// begin: workaround to overcome Firefox CORS http response headers bug
// https://bugzilla.mozilla.org/show_bug.cgi?id=608735
// Firefox already patched in nightly. Should land in Firefox 21.
// CORS "simple response headers" http://www.w3.org/TR/cors/
var value,
simpleHeaders = ["Cache-Control", "Content-Language", "Content-Type",
"Expires", "Last-Modified", "Pragma"];
if (!responseHeaders) {
responseHeaders = "";
forEach(simpleHeaders, function (header) {
var value = xhr.getResponseHeader(header);
if (value) {
responseHeaders += header + ": " + value + "\n";
}
});
}
// end of the workaround.
// responseText is the old-school way of retrieving response (supported by IE8 & 9)
// response and responseType properties were introduced in XHR Level2 spec (supported by IE10)
completeRequest(callback,
status || xhr.status,
(xhr.responseType ? xhr.response : xhr.responseText),
responseHeaders);
}
};
if (withCredentials) {
xhr.withCredentials = true;
}
if (responseType) {
xhr.responseType = responseType;
}
xhr.send(post || '');
}
if (timeout > 0) {
var timeoutId = $browserDefer(timeoutRequest, timeout);
} else if (timeout && timeout.then) {
timeout.then(timeoutRequest);
}
function timeoutRequest() {
status = -1;
jsonpDone && jsonpDone();
xhr && xhr.abort();
}
function completeRequest(callback, status, response, headersString) {
// URL_MATCH is defined in src/service/location.js
var protocol = (url.match(SERVER_MATCH) || ['', locationProtocol])[1];
// cancel timeout and subsequent timeout promise resolution
timeoutId && $browserDefer.cancel(timeoutId);
jsonpDone = xhr = null;
// fix status code for file protocol (it's always 0)
status = (protocol == 'file') ? (response ? 200 : 404) : status;
// normalize IE bug (http://bugs.jquery.com/ticket/1450)
status = status == 1223 ? 204 : status;
callback(status, response, headersString);
$browser.$$completeOutstandingRequest(noop);
}
};
function jsonpReq(url, done) {
// we can't use jQuery/jqLite here because jQuery does crazy shit with script elements, e.g.:
// - fetches local scripts via XHR and evals them
// - adds and immediately removes script elements from the document
var script = rawDocument.createElement('script'),
doneWrapper = function() {
rawDocument.body.removeChild(script);
if (done) done();
};
script.type = 'text/javascript';
script.src = url;
if (msie) {
script.onreadystatechange = function() {
if (/loaded|complete/.test(script.readyState)) doneWrapper();
};
} else {
script.onload = script.onerror = doneWrapper;
}
rawDocument.body.appendChild(script);
return doneWrapper;
}
}
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